public class dome {
    public static void main(String[] args) {
        String s = "LOBdvs";
        StringBuilder stringBuilder= new StringBuilder();
        for(int i = 0;i<s.length();i++){
            char ch = s.charAt(i);
            if(isUpper(ch)){
                ch = (char)(ch+32);
                stringBuilder.append(ch);
            }else{
                stringBuilder.append(ch);
            }
        }
        System.out.println(stringBuilder.toString());
    }
    public static boolean isUpper(char ch){
        if(ch>='A'&&ch<='Z'){
            return true;
        }else{
            return false;
        }
    }
}
